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A019193 as a simple table

na(n)
30
40
52
68
74
820
950
10124
11234
12708
131548
143862
159234
1624723
1757884
18151618
19379592
20998060
212518128
226681575
2317316668
2446002619
25120672278
26322875444
27855590998
282294409103
296123605446
3016472081266
3144156377366

[0,0,2,8,4,20,50,124,234,708,1548,3862,9234,24723,
 57884,151618,379592,998060,2518128,6681575,
 17316668,46002619,120672278,322875444,855590998,
 2294409103,6123605446,16472081266,44156377366]